Zurn z100-4nh-c-r Cast Iron Roof Drain 4 Inch No-hub

Product Description

The ZURN z100-4nh-c-r is a cast iron roof drain designed for flat and low-slope roofing systems in commercial and light-industrial construction. It ships as a complete assembly including a 15-inch round low-silhouette poly dome, a roof sump receiver, and an underdeck clamp. The 4-inch no-hub outlet connects directly to standard no-hub cast iron or compatible DWV piping. The low-profile dome design keeps leaves, debris, and birds out while allowing rainwater and snowmelt to flow freely into the drain body. Licensed plumbers and roofing contractors typically specify and install this unit on built-up, EPDM, or membrane roofing assemblies.

This drain is suited for commercial flat-roof applications including restaurants, warehouses, multi-unit residential buildings, assisted living facilities, and similar structures where controlled roof drainage is required. The included underdeck clamp secures the drain body to the roof deck assembly, and the sump receiver creates a low point that promotes positive drainage toward the drain opening. The 4-inch no-hub outlet allows connection to below-deck horizontal or vertical cast iron waste lines without lead-and-oakum joints.

Key Features

• 15-inch round low-silhouette poly dome screens debris while maintaining high flow capacity
• Cast iron drain body provides long-term durability in commercial roofing environments
• Roof sump receiver promotes positive drainage and reduces standing water around the drain
• Underdeck clamp included for secure attachment to the roof deck assembly
• 4-inch no-hub outlet simplifies connection to standard no-hub DWV piping systems

Compatibility

Designed as an OEM-style replacement or new-installation roof drain for commercial flat-roof drainage systems using 4-inch no-hub cast iron or compatible DWV piping.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC requirements for roof drainage systems. Shut off any active water supply and ensure the roofing membrane is properly flashed and sealed around the drain body before securing the underdeck clamp. Do not overtighten the no-hub coupling beyond the torque specified by the coupling manufacturer. Verify that the installed drain elevation creates a positive slope toward the sump receiver to prevent ponding.